Model # 787264

Internet #100549260

Store SKU #787264

Thermasheath Rmax Thermasheath-3 1 in. x 4 ft. x 8 ft. R-6 Polyisocyanurate Rigid Foam Insulation Board
0719968750017

Thermasheath

Rmax Thermasheath-3 1 in. x 4 ft. x 8 ft. R-6 Polyisocyanurate Rigid Foam Insulation Board

  • Energy efficient
  • For use in residential and commercial buildings
  • ENERGY STAR approved
$ 21 22
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Frequently Bought Together

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Product Overview

  • Energy efficient
  • For use in residential and commercial buildings
  • ENERGY STAR approved
R-Matte Plus-3/Thermasheath-3 is rigid foam plastic thermal insulation board composed of environmentally sound, closed cell, polyisocyanurate foam bonded to a durable white-matte (non-glare) aluminum facer and a reflective reinforced aluminum facer. This product is suitable for use in wall sheathing applications in new residential, commercial and agricultural buildings and for thermal retrofit construction to existing buildings. This ENERGY STAR qualified R-Matte Plus-3/Thermasheath-3 provides R6 with dimensions of 1 in. x 4 ft. x 8 ft. This product is designed for exterior and interior, non-structural uses.
  • Rmax polyiso sheathing offers the GREATEST R-value per inch currently available in a rigid foam board
  • R-Matte plus-3/Thermasheath-3 is applied to the exterior or interior face of wood or metal studs to cover all studs, sills, plates and header constructions, thereby providing insulation over areas not normally covered by insulation products
  • Superior resistance to moisture and vapor in above grade applications
  • Polyiso rigid foam board offers superior fire protection properties compared to any other rigid foam board insulation
  • ENERGY STAR qualified to meet or exceed federal guidelines for energy efficiency for year-round energy and money savings
  • When taped and flashed, the Rmax polyiso board greatly reduces air infiltration and prevents thermal bridging caused by heat and cold transmission through studs
  • Lightweight and easily cut to size



  • How much do you need? Let our calculator help:
    Insulation calculator button

Product Overview

  • Energy efficient
  • For use in residential and commercial buildings
  • ENERGY STAR approved
Model #: 787264
Sku #: 787264
Internet #: 100549260

R-Matte Plus-3/Thermasheath-3 is rigid foam plastic thermal insulation board composed of environmentally sound, closed cell, polyisocyanurate foam bonded to a durable white-matte (non-glare) aluminum facer and a reflective reinforced aluminum facer. This product is suitable for use in wall sheathing applications in new residential, commercial and agricultural buildings and for thermal retrofit construction to existing buildings. This ENERGY STAR qualified R-Matte Plus-3/Thermasheath-3 provides R6 with dimensions of 1 in. x 4 ft. x 8 ft. This product is designed for exterior and interior, non-structural uses.

  • Rmax polyiso sheathing offers the GREATEST R-value per inch currently available in a rigid foam board
  • R-Matte plus-3/Thermasheath-3 is applied to the exterior or interior face of wood or metal studs to cover all studs, sills, plates and header constructions, thereby providing insulation over areas not normally covered by insulation products
  • Superior resistance to moisture and vapor in above grade applications
  • Polyiso rigid foam board offers superior fire protection properties compared to any other rigid foam board insulation
  • ENERGY STAR qualified to meet or exceed federal guidelines for energy efficiency for year-round energy and money savings
  • When taped and flashed, the Rmax polyiso board greatly reduces air infiltration and prevents thermal bridging caused by heat and cold transmission through studs
  • Lightweight and easily cut to size



  • How much do you need? Let our calculator help:
    Insulation calculator button

Info & Guides

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Name 1 in. x 4 ft. x 8 ft. R-3.85 Insulating Sheathing Rmax Thermasheath-3 1 in. x 4 ft. x 8 ft. R-6 Polyisocyanurate Rigid Foam Insulation Board FOAMULAR 150 1 in. x 4 ft. x 8 ft. R-5 Scored Square Edge Rigid Foam Board Insulation Sheathing Rmax Thermasheath-3 2 in. x 4 ft. x 8 ft. R-13.1 Polyisocyanurate Rigid Foam Insulation Board
Brand R-Tech Thermasheath Owens Corning Thermasheath
Ratings (105) (68) (141) (52)
Sheathing Type EPS ISO XPS ISO
Insulation Location 2x4 Walls,2x6 Walls,Attics,Basements,Crawlspaces,Exterior Sheathing,Exterior Wall Foundation,Garage,Under Slab 2x4 Walls,2x6 Walls,Attics,Basements,Ceilings,Crawlspaces,Ducts,Exterior Sheathing,Garage,Re-Siding 2x4 Walls,2x6 Walls,Exterior Sheathing 2x4 Walls,2x6 Walls,Attics,Basements,Ceilings,Crawlspaces,Exterior Sheathing,Garage,Re-Siding
Product Width (in.) 48 in 48 in 48 in 48 in
Product Length (ft.) 8 ft 8 ft 8 ft 8 ft
Faced or Unfaced Faced Faced Unfaced Faced
Product Thickness (in.) 1 in 1 in 1 in 2 in
View Product View Product View Product View Product

Specifications

Dimensions

Coverage Area (sq. ft.)
32 ft²
Product Length (ft.)
8 ft
Product Thickness (in.)
1 in
Product Width (in.)
48 in

Details

Faced or Unfaced
Faced
Insulation Features
Formaldehyde Free
Insulation Location
2x4 Walls,2x6 Walls,Attics,Basements,Ceilings,Crawlspaces,Ducts,Exterior Sheathing,Garage,Re-Siding
Insulation R-Value
R6
Insulation Type
Foam Board Insulation
Interior/Exterior
Exterior
Product Weight (lb.)
7lb
Sheathing Type
ISO

Warranty / Certifications

Warranty Information
Standard Warranty

Specifications

Dimensions

Coverage Area (sq. ft.)
32 ft²
Product Length (ft.)
8 ft
Product Thickness (in.)
1 in
Product Width (in.)
48 in

Details

Faced or Unfaced
Faced
Insulation Features
Formaldehyde Free
Insulation Location
2x4 Walls,2x6 Walls,Attics,Basements,Ceilings,Crawlspaces,Ducts,Exterior Sheathing,Garage,Re-Siding
Insulation R-Value
R6
Insulation Type
Foam Board Insulation
Interior/Exterior
Exterior
Product Weight (lb.)
7lb
Sheathing Type
ISO

Warranty / Certifications

Warranty Information
Standard Warranty

Questions & Answers

Does R-Max need to be covered by 1/2" sheetrock when installed on basement walls?

Asked by: Randy
Rmax Thermasheath-3 needs to be covered when installed on basement walls. https://www.rmax.com/s/Rmax-Thermasheath-3-Data-Sheet.pdf "WARNING - DO NOT leave Thermasheath®-3 exposed. Polyiso foam is an organic material which will burn when exposed to an ignition source of sufficient heat and intensity and may contribute to flames spreading. Installations utilizing Thermasheath®-3 must be fully protected on the inhabited side of the building by a thermal barrier such as a minimum of 1/2” gypsum wallboard, or equivalent. Consult local Building Codes and insurance authorities regarding special applications or details required when using Thermasheath®-3 as an exposed product." Rmax has three products named Thermasheath; Thermasheath-3, Thermasheath-SI, and Thermasheath-XP. You want Rmax Thermasheath-XP for exposed installations. https://www.rmax.com/thermasheath-xp AFAIK, Thermasheath-XP is not sold by HomeDepot currently.
Answered by: anotherguy
Date published: 2018-09-07

Can this be doubled and create a better r value I have a metal building I wish to insulate but d...

Can this be doubled and create a better r value I have a metal building I wish to insulate but do not wan to use rolls/batts or blow in I do not think the R value of this is enough for the shed
Asked by: Betty
I’m sure it could be , we used it on our sliding door on pole barn , we used the 2” insulated board on the walls and ceiling , it is easy to work with and put up , we noticed a difference immediately, after putting up one corner . Really like this product!!
Answered by: Customer
Date published: 2018-01-06

Can this be used to insulate between the floor joist underneath my wood frame home? I just purch...

Can this be used to insulate between the floor joist underneath my wood frame home? I just purchased it. It was built in 1954, wood floors and I just removed the hideous carpet in it. Now my electric bill is through the roof.......please help!
Asked by: JC
i would not use this product for your job. conventional insulation would be better and provide a much higher R value. This R-Max product is a real good choice but not for in between joists,. don't forget paper to the heated side of application.
Answered by: HOLMESWANABE
Date published: 2018-10-09

I've seen on-line where this is used to build an air tight "box" around can/recessed lights in th...

I've seen on-line where this is used to build an air tight "box" around can/recessed lights in the attic. Box is sealed with fire resistant foam. Is this an acceptable use for it?
Asked by: Geno
Acceptable use? Certainly. So long as the foam isn't right against the can lights own dome and doesn't pinch any wiring. It us UL Fire rated and while I would just use the appropriate tape to seal the edges. Fire resistant foam should be fine. Just don't fill the box with the foam.
Answered by: Nick
Date published: 2018-01-05
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Customer Reviews

Rmax Thermasheath-3 1 in. x 4 ft. x 8 ft. R-6 Polyisocyanurate Rigid Foam Insulation Board is rated 4.7 out of 5 by 68.
Rated 5 out of 5 by from I had a large quonset workshop that needed to be insulated and heated. After getting spray foam c... I had a large quonset workshop that needed to be insulated and heated. After getting spray foam cost of more than $15,000, i started to explore other more cost effective alternatives. I decided to batten the inside of the workshop and then attach two layers of 1 " Polyisocyanates foam, overlapping all the joins and sealing all the joints with cans of spray foam and tape. As you can see from the pictures this worked very well and gave a much more attractive finish than just spray foam would have done. I am able to heat this large space ( 32'x50'x15' heigh) with just a pellet stove ( rated at 2000 sq ft) Setting the stove on Minimum and with an outside temperature on 32F i can maintain a workshop temperature of 55F which for me is an ideal working temp. I believe in total it cost me around $5000 and took 4 weeks to complete working on my own. With help it would probably only take a week, It was worth all the time i spent saving $10,000 and getting an R-value of at least R12.
Date published: 2018-12-01
Rated 5 out of 5 by from Great product Our garage door faces East, During the summer our garage gets super hot and stays hot all the time. I was on a mission and decided to start with insulating the door. I did some research and stumbled across the RMAX ThermaSheath, I marched to HD and purchased 4 x 4x8 sheets, setup a work table and started ripping these sheet into 2x4 panels. I ended up wasting most of the first sheet as I broke some trying to bend it to fit in the garage door panel, ( These boards are rigid and do not bend easy ), so I decided to use a different approach, I cut each of the 2x4 panel into 3 sections, inserted the left, then right and finally the middle section, I finished it by taping the sections wth metal duct tape and viola ... Today, the outdoor temperature is a sunny 75 F, a few of the un-insulated panels are at 114 F according to my FLIR TG-165, ( See image ) makes me wonder why did I wait so long to do this. Totally worth the price and definately cheaper than the pre-cut solutions offered by various other retailers.
Date published: 2016-09-19
Rated 5 out of 5 by from This rigid foam insulation had the highest r-value per inch of thickness of the types sold at Hom... This rigid foam insulation had the highest r-value per inch of thickness of the types sold at Home Depot. I used it for insulating our garage door. Very easy to cut with a sharp utility knife.
Date published: 2018-12-26
Rated 5 out of 5 by from This stuff is great for crafts! I used it to make temporary house numbers after the painters th... This stuff is great for crafts! I used it to make temporary house numbers after the painters threw ours away. It's really easy to carve -- I used a utility knife and a Dremel. Then I shot it with some leftover metallic spray paint and affixed it to the house with double-sided tape. This was meant to be a temporary fix, because house numbers are important if you want to get pizzas and UPS deliveries. Also, I wanted to see a visual representation of actual numbers on our house to help us decide if we wanted 4" or 6" numbers, and if we wanted the "Palm Springs" font or the "NeoModern" font. Attractive house numbers are expensive, and every scammer in the world is selling junky ones for a gazillion dollars on Amazon. Don't get me started! Anyway, in the last three days, five nearby neighbors and six dog-walking neighbors have come up to me while working in the yard and asked where to get those numbers for their house. This foam is great stuff and I'm tempted to find some commercial uses for it.
Date published: 2017-09-15
Rated 5 out of 5 by from EASY TO WORK WITH SEEMS TO BE A GREAT WAY TO GO FOR HOLDING THE HEAT IN OR HEAT OUT. MY SHOP SIZE... EASY TO WORK WITH SEEMS TO BE A GREAT WAY TO GO FOR HOLDING THE HEAT IN OR HEAT OUT. MY SHOP SIZE IS RIGHT AT 2,000 SQ. FT. I DID A LOT OF RESEARCH BEFORE I WENT WITH THIS R MAX AND IT SEEMS TO BE DOING THE TRICK! THE ONLY TROUBLE I'M HAVING IS THE FOIL TAPE I'M USING FROM HOME DEPOT IS BEGINNING TO PULL OFF AND NOT STICKING WHICH MEANS I'LL HAVE TO RE DO THAT WITH A DIFFERENT BRAND. AFTER THE BOARDS WENT UP I WIPED THE BOARDS WITH A DAMP RAG TO GET A CLEAN SURFACE BEFORE THE TAPE WAS INSTALLED AND APPEARED TO HOLD VERY GOOD BUT WEEKS LATER IT DID NOT STICK. I WOULD DEFINITELY RECOMMEND THE R-MAX TO ANYONE THAT WANTS TO HAVE A PRODUCT THAT IS EASY TO WORK WITH CONSISTENT QUALITY. MAYBE SOMEONE FROM R-MAX WILL READ THIS AND COME OUT WITH A FOIL TAPE THAT THEY HAVE TESTED TO WORK WELL AGAINST THE FOIL THEY USE ON THE R-MAX BOARDS. :)
Date published: 2018-10-16
Rated 4 out of 5 by from Worked well and cut fine with table saw. Only complaint... Worked well and cut fine with table saw. Only complaint is the creases you can see in the aluminum. I used it as a cover for my fireplace face to stop the draft when not in use and it held paint fine!
Date published: 2018-12-26
Rated 5 out of 5 by from It is doing a good job I actually used it... It is doing a good job I actually used it on the inside of my pole barn it looks a little like the space shuttle there is providing a good insulation barrier easy to work with easy to cut
Date published: 2018-12-26
Rated 5 out of 5 by from I used it to line a storage shed housing tortoises... I used it to line a storage shed housing tortoises for the winter. It kept the temperature in there 10 degrees warmer. The man who did the work said it was easy to use and cut well.
Date published: 2018-12-04
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